diff options
| author | Damien Le Moal <dlemoal@kernel.org> | 2024-05-30 14:40:32 +0900 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-05-30 15:03:52 -0600 |
| commit | b164316808ec5de391c3e7b0148ec937d32d280d (patch) | |
| tree | 7a4979ebc03838d7c68c6df3db9f18d3c5dd8659 /drivers/block | |
| parent | 1521dc2410837222e8f0211b8e76898880c4d263 (diff) | |
null_blk: Do not allow runt zone with zone capacity smaller then zone size
A zoned device with a smaller last zone together with a zone capacity
smaller than the zone size does make any sense as that does not
correspond to any possible setup for a real device:
1) For ZNS and zoned UFS devices, all zones are always the same size.
2) For SMR HDDs, all zones always have the same capacity.
In other words, if we have a smaller last runt zone, then this zone
capacity should always be equal to the zone size.
Add a check in null_init_zoned_dev() to prevent a configuration to have
both a smaller zone size and a zone capacity smaller than the zone size.
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240530054035.491497-2-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/null_blk/zoned.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/block/null_blk/zoned.c b/drivers/block/null_blk/zoned.c index 79c8e5e99f7f..f118d304f310 100644 --- a/drivers/block/null_blk/zoned.c +++ b/drivers/block/null_blk/zoned.c @@ -74,6 +74,17 @@ int null_init_zoned_dev(struct nullb_device *dev, return -EINVAL; } + /* + * If a smaller zone capacity was requested, do not allow a smaller last + * zone at the same time as such zone configuration does not correspond + * to any real zoned device. + */ + if (dev->zone_capacity != dev->zone_size && + dev->size & (dev->zone_size - 1)) { + pr_err("A smaller last zone is not allowed with zone capacity smaller than zone size.\n"); + return -EINVAL; + } + zone_capacity_sects = mb_to_sects(dev->zone_capacity); dev_capacity_sects = mb_to_sects(dev->size); dev->zone_size_sects = mb_to_sects(dev->zone_size); |